If you need to write an installment payment agreement, here is a sample agreement letter for installment payment you can use.
To whom it may concern:
We are proud to have entered into this agreement with your company. Just sign on the contract and we will accept the initial payment. We have indicated when the remaining balances should be paid.
Once you sign on this contract, everything is final. Thus, you can’t change anything that is stated on it. Once you pay the first quarter of your debt, you will receive a corresponding invoice. This will confirm what you have paid so far and what balance you need to pay.
If you have any questions about this agreement, please don’t hesitate to give me a call. I would be more than happy to answer any inquiries. We thank you for entering into this agreement and we look forward to doing business with you again in the future.